div{
    color: red;
}
div.c-blue{
    color: blue;
}
div.c-blue#like{
    font-size: 32px;
}
div.c-blue#like:after{
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: black;
}
/*无效，伪元素后面只能拼接伪元素*/
div.c-blue#like:after p{
    font-size: 20px;
}

/* 有效 */
div.c-blue#like+p{
font-size: 20px;
    line-height: calc( 20 + 2px);
    font-size: max(20px,32px);
}
